Pipefitter Pipe Testing and Inspection 5

Question 1

What is the correct sequence of steps when isolating a section of piping for a pressure test using spectacle blinds?

Accepted Answer

Depressurize, install blind, test, remove blind and restore

Answer

The line must be depressurized and isolated before installing the spectacle blind; testing is then performed, and the blind is removed to restore flow after the test.

Question 2

In radiographic testing (RT) of a weld, what does a 'density' reading refer to?

Accepted Answer

The darkness of the radiographic image

Answer

Density in RT refers to the degree of blackening on the radiographic film, which is controlled to ensure defects of the minimum required size are detectable.

Question 3

Which ASME code governs the testing requirements for process piping systems in industrial facilities?

Accepted Answer

ASME B31.3

Answer

ASME B31.3, Process Piping, governs the design, fabrication, and testing requirements for piping in chemical and industrial process plants.

Question 4

When a piping system cannot be hydrostatically tested due to structural limitations, what alternative test may be used with additional precautions?

Accepted Answer

Pneumatic test

Answer

A pneumatic test using compressed gas may be substituted for hydrostatic testing when the system cannot support the weight of water, but it requires additional safety precautions due to stored energy hazards.

Question 5

What is the significance of a 'zero-leakage' requirement in a seat leakage test for valves?

Accepted Answer

No leakage is permitted past the valve seat at test pressure

Answer

Zero-leakage seat testing (Class VI per ANSI/FCI 70-2) means no measurable fluid passes the closed valve seat during the test, required for critical shut-off applications.

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Pipefitter Pipe Testing and Inspection 5